气/液同轴离心式喷嘴流量及雾化特性实验

Experimental study on flow rate and spray characteristic of coaxial centrifugal injector

关键词:  离心喷嘴  流量  推进剂雾化  实验

Key words:  Centrifugal injector  Flow rate  Propellant spray  Experimentation

摘要:

通过实验方法,研究气/液同轴离心式喷嘴的流量特性及气液之间的相互影响,研究压降及缩进长度对喷嘴雾化特征的影响。研究表明,液喷嘴流量受气喷嘴压降影响,流量增大或减小取决于缩进室内气喷嘴对液喷嘴产生的是引射还是堵塞作用;同一喷嘴,液膜破碎长度及液滴尺寸随压降增大而减小;液滴尺寸分布沿喷嘴横截面呈马鞍型分布,曲线的最高点和分布宽度随喷嘴几何特性及压降变化;提高气/液之间的相对运动速度,可提高雾化质量;随着缩进长度增大,雾化质量明显变好。

Abstract:

Flow rate and spray characteristic of gas/liquid coaxial centrifugal injector was studied experimentally, including the flow rate characteristics of individual liquid injector, individual gas injector and the interaction between the liquid and gas injector. The results suggest that the liquid injector flow rate is affected by gas injector pressure, the flow rate change is decided by attract or jam effect of gas injector on liquid injector. For the same injector, the length of liquid film breaks up and the droplet size decrease when pressure increases. The distribution of droplet size shows saddle shape along the injector cross section. The peak and length of curve changes with the injector geometry characteristics and pressure. The spray quality is improved when the relative speed and length of indent chamber increase.